Resource Management Group Ltd

Phone 03-365 7056

Level 4, 69 Oxford Terrace PO Box 9053, Tower Junction, Christchurch 8149

3 March 2015 Catherine Challies Team Leader - Industrial Consents Section Environment Canterbury PO Box 345 CHRISTCHURCH 8140

File CD008.24

Dear Catherine APPLICATION PURSUANT TO S127 OF THE RESOURCE MANAGEMENT ACT 1991; TO VARY THE CONDITIONS OF

CONSENT CRC122051; TO AMEND THE DESIGN OF THE STORMWATER OUTFALL STRUCTURE FROM PRESTONS

SOUTH FIRST FLUSH BASIN S1 INTO SNELLINGS DRAIN. Introduction

This is an application pursuant to s127 of the Resource Management Act 1991 to vary the conditions of consent CRC122051. It is required in order to amend the design of the stormwater outfall structure from Prestons south first flush basin S1 into Snellings drain. This letter outlines the proposal and its background and provides a brief assessment of affects in line with section 127 of the Act. Background Prestons Road Limited (PRL) holds resource consent CRC122051 from Environment Canterbury (ECan) to install and maintain outlet structures on the bed and banks of Styx River and Snellings Drain. A copy of the consent as approved is attached (see Appendix One). The outfall structures are at the discharge points for the stormwater discharge1 from the Prestons subdivision from both Styx and Snellings catchments. The modifications requested to the consent relate only to the outlet structure into Snellings Drain, however as discussed with Stuart Edwards at ECan, clearer detailed design plans of the Styx River outlet have also been provided, and do not differ from those approved under the original consent. The Snellings Drain outlet structure originally authorised under Consent CRC122051 was an ‘outlet structure and riprap protection’ (Condition 1) to be constructed and maintained as shown on Plan CRC122051B, along with installation of diversion structures during the construction (Condition 2). The attenuation/first flush basin and outfall design has since been revised during detailed design discussions overseen by the consent holders engineers (Aurecon) and CCC stormwater engineers.

1 For reference, the consent which authorises the discharge of residential stormwater into Snellings Drain is CRC136519

(formerly consent CRC120429, then CRC133210).

2

CCC is closely involved with the design as the system is to be eventually vested with them for ongoing operation and management. It is also of note that some of the modifications to the Prestons South stormwater system (since the granting of CRC122051) have arisen from CCC’s redevelopment of Clare Park to provide stormwater attenuation within the wider Snellings Catchment including that from Prestons South. As attenuation for the wider area’s stormwater is to be provided in Clare Park, Prestons South was only then required to provide first flush treatment to lessen ongoing maintenance and monitoring costs for CCC. It is also noted that Condition 5 of CRC122051 consent requires that works only occur between 1 September and 30 April and during periods of predicted dry weather. The consent holder needs to install the outlet structure by 30 April 2015 in order to enable CCC to issue the s224C subdivision completion certificate which then allows for titles to be issued. Given that these works are on a critical time path, and assuming that ECan have no concerns with the changes proposed, it is requested that this application is approved promptly. Requested Variation to Consent CRC122051 The original application documents for CRC122051 included a concept drawing showing an 825mm diameter concrete pipe discharging into Snellings Drain from a Prestons South attenuation basin, along with the proposed works to include riprap rock scour protection and minor earthworks in the steam bed. This plan has been approved as part of consent CRC122051, and is referenced in consent conditions as ‘Plan CRC122051B’. The revised detail now includes an open channel high flow bypass into Snellings Drain, discharging into a widened point in the drain, providing a deepened pooling area to slow the speed of discharging water. As per the original application, the pipe outlet is stabilised with riprap. A written statement from project engineers Aurecon fully outlining the design changes is provided in Appendix Two, with the amended plans for the Snellings outfall provided in Appendix Three. In order to authorise these changes to the stormwater system, this application requests that Condition 2 be amended in so far as approved consent plan CRC122051B is superseded by those plans provided in Appendix Three to reflect the detailed design changes. As plan CRC122051B includes details of the Styx outfall from the Prestons North development, this detail is also re-provided in the detailed design plan contained in Appendix Four to this application. The Styx outfall remains in accordance with the original approved plan. It is anticipated that this plan is also captured within an amended Condition 2. As discussed in this application, the effects from making these changes will result in the same or similar effects on the receiving environment. Section 127 application The RMA enables a holder of a resource consent to apply to the relevant consent authority for a change or cancellation of a condition of a consent. Section 127 states that sections 88 to 121 of the RMA apply as if:

(a) the application were an application for a resource consent for a discretionary activity;

3

and

(b) the references to the resource consent and to the activity were references only to the change or cancellation of a condition and the effects of the change or cancellation respectively.

This application relates to the installation and maintenance of a stormwater outfall into the Snellings Drain. As noted above, a letter from Aurecon is provided in Appendix Three to this application setting out the design changes. The assessment of environmental effects is carried out in the next section of this letter and concludes that effects will be the same or similar to those authorised under the existing consent. For the purposes of determining persons who may be adversely affected by the change in the scope of the resource consent, the Consent Authority must consider every person who:

(a) made a submission on the original application; and (b) may be affected by the change.

As stated above, the application only seeks to modify the physical design of the outfall into Snellings Drain. The modification will not change the properties of the drainage system as approved under stormwater consent CRC136519. CCC – as a potentially affected party and future operators of the system - have provided their approval to the modification by way of engineering approval for construction. No further parties are identified as affected as a result of this application. Assessment of Environmental Effects The environmental effects arising from the modified outlet structure are outlined in the letter (see Appendix Two) provided by Aurecon. To summarise, the amendment to the outlet provides for discharge of treated stormwater into a widened section of Snellings Drain, reducing the velocity of the discharge. This reduces scour in the stream bed which also provides a better solution for the ecology of the stream. Consent CRC122051 has conditions in place to avoid adverse effects from the construction of the outlet and scour protection within the bed of the stream, including minimising/avoiding works in high stream flows or flowing water, and requirements to re-stabilise the works site. The development of the amended outfall will still be able to be undertaken in accordance with those conditions, and therefore construction effects will also remain the same or similar to those consented. The effects on the environment from the amendment are therefore considered to be a likely improvement upon the original design particularly in terms of ecological outcomes, and ultimately, will be less than minor.

4

Conclusion

Consent CRC122051 allows PRL to install and maintain outlet structures in both the Styx and Snellings Drain. The outfall structure into Snellings Drain has been modified from that originally consented, in collaboration with CCC who will inherit the system. CCC has approved the engineering plans for the modified outfall. It is considered that the request to vary CRC122051 is appropriate under the terms of the RMA. As a discretionary activity, pursuant to s127 of the RMA, the consent authority may grant of refuse the consent, and if granted, may impose conditions. We consider that consent should be granted as the effects will be similar (and potentially less) to those under consent CRC122051, and with CCC’s engineering approval for the works, no further affected parties are identified. The application fee of $598 (including GST) is included for the processing of this application. Please provide a receipt of the lodgement fee and acknowledgment letter. If you have any questions regarding this application, please do not hesitate to contact me.

Yours Sincerely, Resource Management Group Limited

Joanne Pacey David McMahon Consultant Planner Director DDI (03) 962 1801 Email: joanne@rmgroup.co.nz List of Appendices

1. Consent CRC122051 (including approved plans)

2. Aurecon Letter

3. Snellings Stormwater Outfall Plans (Amended)

4. New Styx Stormwater Outfall Plan

5

APPENDIX ONE:

Consent CRC122051 (including approved plans)

6

APPENDIX TWO:

Aurecon Letter

Content Server\C:\Users\sean.husband\AppData\Roaming\OpenText\OTEdit\EC_cs\c77368914\235361 - Prestons South - Stormwater Outlet Structure

Assessment of Environmental Effects.doc Page 1

27 February 2015

CDL Land New Zealand Limited PO Box 3248 Auckland 1140 Via E-mail Attention: Mr Jason Adams Dear Jason

RE: CRC122051 Revised Snellings Drain stormwater outlet detail 1. Introduction

Following the detailed design of the Prestons South stormwater management system, the outlet detail into Snellings Drain has been modified from the concept drawing (CRC122051B) which was provided to Environment Canterbury (ECan) with the original consent application. This report describes the changes in the outlet design and includes an assessment of the environmental effects that the revised outlet detail will have on the receiving environment. It is noted that the construction works relating to the stormwater outlet from Prestons North into the Lower Styx River have been completed as per the consent conditions. Please find attached Aurecon Construction drawings 223488-002-LD-PN-S2-DP-15 [Rev0] for the stormwater outlet into Lower Styx River for ECan records.

2. Summary of the changes to the stormwater outlet detail

Aurecon drawing 223488-002-C-10 [RevA] (CRC122051B) was provided to ECan in the initial consent application. The concept drawing shows an 825mm diameter concrete pipe discharging directly into Snellings Drain from an attenuation basin located within CDL land. The outlet design required works within Snellings Drain including minor earthworks to widening the streambed and the placing of riprap rock within the channel to provide scour protection from the pipe discharge. The attached Aurecon drawings 235361-LD-PS-S1-DP-01 [Rev2] and 235361-LD-PS-S1-DP-13 [Rev2] show the revised stormwater outlet detail. The revised outlet detail was amended during the detailed design phase in collaboration with Christchurch City Council (CCC) stormwater engineers and has received CCC engineering approval for construction. The revised outlet design includes an open channel high flow bypass into Snellings Drain. The open channel design includes a deepened and widened pooling area at the outlet to Snellings drain. This is designed to slow the velocities of the discharging water prior to discharging into Snelling Drain. The revised detail shows a piped outlet from First Flush Basin S1 discharging into the pooling area within the CDL land. The piped outlet is stabilised with riprap.

3. Assessment of Environmental Effects

An assessment of environmental effects has been completed focusing on any new environment effects from the revised outlet detail that would not have been previously covered under the existing consented design. An assessment of the major design changes and their environmental effects is given below: Discharge into Snellings Drain via open channel

The revised outlet detail shows all stormwater being discharged into Snellings Drain from the Prestons South development via an open channel drain.

T +64 3 366 0821

F +64 3 379 6955

E christchurch@ap.aurecongroup.com

W aurecongroup.com

Aurecon New Zealand Limited

Unit 1

150 Cavendish Road

PO Box 1061

Christchurch 8140

New Zealand

Content Server\C:\Users\sean.husband\AppData\Roaming\OpenText\OTEdit\EC_cs\c77368914\235361 - Prestons South - Stormwater Outlet Structure

Assessment of Environmental Effects.doc Page 2

At the outlet location a widened/deepened pooling area has been designed to create an improved environmental solution for ecological development. This is consistent with the six values of an integrated stormwater system. The widened outlet proposed would decrease water velocities entering Snellings Drain and thus decrease the likelihood of any discharge related erosion of Snellings Drain. The construction of the outlet requires earthworks causing temporary disturbance of the western embankment of Snellings Drain. The erosion and sediment controls for these works will be designed, constructed and certified prior to construction commencing as per the existing CCC bulk earthworks consent (RMA92019351).The actual disturbance of the existing stream bed will be minor and can be considered negligible. Stormwater basin piped outlet structure discharging into the internal pooling area

The revised outlet detail shows the piped outlet from First Flush Basin S1 discharging into a widened/deepened pooling area within the Prestons South development rather than directly into Snellings Drain. The pooling area provides an offline location for the dissipation of energy and high water velocities following discharge from the piped outlet. Rip rap stabilising the piped outlet is designed downstream of the outlet pipe to minimise any discharge related erosion. The new outlet detail removes the requirement for any stabilisation infrastructure to be constructed within the existing Snellings drain. 4. Conclusion

Throughout the detailed design the design of the Snellings Drain outlet was modified from the concept detail that was included in the consent application. The revised outlet detail was designed in collaboration with CCC stormwater engineers and has received engineering approval for construction. The revised outlet design is an improvement from the originally consented plans and any environmental effects associated with the amendments are negligible.

Yours faithfully,

Sean Husband Civil Engineer: Land Development

7

APPENDIX THREE:

Snellings Stormwater Outfall Plans (Amended)

J1

J2

J3DN600

1:25.7RCRRJ C2

(3.9%)

11.58

200 Ø uPVC

0

5.40CHAINAGE

R.L. OF FIN.SURF.

R.L. OF INVERT

DEPTH TO INVERT

DATUM R.L. 0.0

10.85

0.00

10.40

0.45

12.65

11.58

10.85

9.75

1.75

2.90

10.90

16.98

10.30

9.70

0.60

1.20

2.30

10.30

OUTL

ETOPENCHANNEL S1 IN

SPEC

TION

CHAM

BER

FFB S1INLE

T

FFB S1 LOWFLOWSECTION J

DP-011:200

300mm TOPSOIL

600mmØ RCRRJ

SCOUR PROTECTION MIN150mmØ ROCKS HELD BYCONCRETE

COMPACTEDM/4:AP40

HAUNCHINGMETAL

CUT END 45° TO MID PIPE GRINDBACK EXPOSED STEEL 20mm &PLACE BEAD OF EPOXYMORTAR ON CUT SURFACE.

1500mm

41

PWL RL 10.70

OPEN CHANNEL S1

ANTI-SEEPCOLLARSAT 4m CRS

IL 10.40

1650mmØ GANVANISED STEELWEBGRATING WITH STEPPED SHROUDTO PROVIDE BAFFLE TO OUTLET

600mmØ RCRRJIL 10.85

200mmØ uPVCIL 10.25

RL 12.65

41

600m

m

1200mmØ MANHOLE RISERTOP OF RISER AT RL 12.10

300mm

150MM WIDE SLOT INCONCRETE RISER (STAGE 1)

150m

m10

0mm

SLUICE VALVE

RETAINING WALL TO SUPPORTCREST DURING STAGE 1

ANTI-SEEPCOLLARSAT 4m CRS

FINISHED BATTER PROFILE (STAGE 2)

STAGE 1 FF LEVEL RL 11.25 PWL 10.90

DOUBLE SUMP WITH GRATING COVER

CONTROL POINT41

STANDARDHUMES CESSPIT60

0mm

MIN

200mmØ uPVCPROPRIETRY 'TEE' WITHREMOVABLE CAP ON UPPER END

RL 10.60

IL 10.30

FFB S1

SCOUR PROTECTIONMIN 150mmØ ROCKS

CUT END 45° TO MID PIPE GRIND BACKEXPOSED STEEL 20mm & PLACE BEADOF EPOXY MORTAR ON CUT SURFACE.

OPEN CHANNEL S1

1200mmØ MANHOLE WITH FIXEDWEBFORGE GRATE TO SUIT

RL 12.65

11.50

11.00

12.00

12.50

12.50

SNELLINGS DRAINSLUICE VALVE

DOUBLE SUMP LOW FLOWINLET AT RL 11.6

GROUND TO BE PROFILEDAROUND RISER

PWL RL 10.7ANTI-SEEP BLOCKS AT 4m CRS(REFER TO DETAIL ON DWG DP-14)600mmØ RCRRJ

200mmØ uPVC

RETAINING WALL TO SUPPORTCREST DURING STAGE 1

SCOUR PROTECTIONMIN 200mmØ ROCKS

ANTI-SEEP BLOCK

BUND CREST

DOUBLE SUMP LOWFLOW INLET AT RL 10.9

1650mmØ GALVANISEDSTEEL WEBGRATING UNIT

MIN 150mm ROCKSHELD BY CONCRETE

200mmØ uPVCLOW FLOW INLET

150mm WIDEFACE PLATE

200mmØSLUICE VALVE

600mmØ RCRRJ OUTLET

950mmØ DEEP SHROUD

200mmØ uPVCLOW FLOW INLET

WEBGRATING WITHDEDICATED LOCKABLEOPENING TO OPERATEVALVE

CLIENT

PRESTONS SOUTH

DATE

TITLE

REVISION DETAILSDATEREV APPROVED

CHECKED

APPROVED

PROJECTDRAWN DESIGNED

235361PROJECT No.

SCALE SIZE

DRAWING No. REV

A1PRESTONS SOUTH - STAGE 1DRAINAGE PLAN - DETAILS

SHEET 2 OF 3 LD-PS-S1-DP-13 2

AS SHOWN

CONSTRUCTIONW.A.HODGSON S.HUSBAND

N.RAYNOR

K.ASHBYA 19/11/13 FOR APPROVAL K.ASHBYB 10/12/13 FOR TENDER K.ASHBY1 06/06/14 FOR CONSTRUCTION K.ASHBY2 22/07/14 FOR CONSTRUCTION K.ASHBY

0

SCALE 1:25

500250 1000mm

0

SCALE 1:200

2 4 8m

DETAIL J1-1:25

DETAIL J2-1:25

DETAIL J3-1:25

NORMAL WATER LEVEL

DETAIL 2DP-011:100

0

SCALE 1:100

1 4m2

2A

DETAIL 2A-1:50

9.00

10.00

11.0

0

1

1

.

0

0

1

2

.

0

0

12.00

12.00

12.00

1

3

.0

0

13.0013.00

8.75

9.25

9.50

9.75

10.25

1

0

.

2

5

1

0

.5

0

10.5

0

1

0

.

5

0

1

0

.5

0

10.7

5

10.75

1

0

.

7

5

10.7

5

11.2

5

1

1

.2

5

1

1

.5

0

1

1

.5

0

11.5

0

1

1

.5

0

1

1

.7

5

11.75

12.25

12.25

1

2

.

2

5

12.25

12.25

12.50

12.50

12.75

12.75

1

2

.

7

5

12.75

12.75

12.75

1

2

.7

5

13.25

FIRST FLUSHBASIN S1

OPEN CHANNEL S2

OPEN CHANNEL S1

CULVERT AOPEN CHANNEL S3

A

200mmØ uPVC LOWFLOW OUTLET

OVERFLOW SPILLWAYBASE AT RL 12.2

IL 10.30 AT CULVERT

DOUBLECP INLET

WEED HARVESTERLAUNCH AREA

2 x 1600mmØ RCRRJ C4

IL 10.35 AT CULVERT

REFE

R DW

G LD

-PS-

S1-D

P-02

1200mmØMANHOLE

1DP-07

2DP-13

600mmØ RCRRJ C2LOW FLOW OUTLET

JDP-13

3DP-12

LOCATION OF MAINTENANCERAMP - SEE NOTE 1

4

SNELLINGS DRAIN

IL 12.65

PWL RL 10.9 IL 10.6

BASE IL 8.6

DOUBLE SUMP LOW FLOW INLET AT RL 11.6WITH 200Ø uPVC PIPE TO MANHOLE

11.0m 11.0m

SECTION A-

HORIZONTAL 1:200VERTICAL 1:100

3.0m 3.0m

0.00

2.00

4.00

50.006.0

0

8.00

10.00

12.00

14.00

130.0

0

16.00

18.00

20.00

22.00

24.00

26.00

28.00

30.00

32.00

34.00

36.00

38.00

40.00

42.00

44.00

46.00

48.00

124.0

0

126.0

0

128.0

0

132.0

0

134.0

0

136.0

0

138.0

0

140.0

0

142.0

0

144.0

0

146.0

0

148.0

0

150.0

0

152.0

0

154.0

0

156.0

0

158.0

0

160.0

0

162.0

0

164.0

0

166.0

0

168.0

0

170.0

0

172.0

0

174.0

0

176.0

0

178.0

0

180.0

0

182.0

0

184.0

0

186.0

0

188.0

0

CHAINAGES

DATUM 7

RL 12.54 1

4

44 1RL 9.8

1

141

4 1

RL 12.5

IL 8.6

IL 10.6 IL 10.6 IL VARIES

RL 12.65

RL 9.8

PWL = RL 10.9

LEGEND:

TOP OF BANKS

FINISHED SURFACE CONTOURS(250mm INTERVALS)

LOCALISED DEEPENEDPOND AREA

STORMWATER RETICULATION

CLIENT

PRESTONS SOUTH

DATE

TITLE

REVISION DETAILSDATEREV APPROVED

CHECKED

APPROVED

PROJECTDRAWN DESIGNED

235361PROJECT No.

SCALE SIZE

DRAWING No. REV

A1PRESTONS SOUTH STAGE 1DRAINAGE PLAN LAYOUT

SHEET 1 OF 5 LD-PS-S1-DP-01 2

AS SHOWN @ A1

CONSTRUCTIONW.A.HODGSON S.HUSBAND

N.RAYNOR

K.ASHBYA 19/11/13 FOR APPROVAL K.ASHBYB 10/12/13 FOR TENDER K.ASHBY1 06/06/14 FOR CONSTRUCTION K.ASHBY2 14/07/14 FOR CONSTRUCTION K.ASHBY

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3488

-001

-XR-

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, 223

488-

001-

XR-L

0

SCALE 1:100

1 4m2

0

SCALE 1:200

2 4 8m

0

SCALE 1:500

5 10 20m

VERTICAL ELEVATIONS ARE IN TERMS OF CHRISTCHURCH DRAINAGE DATUM.SCIRT PUBLISHED JUNE 2011.THE ORIGIN OF LEVELS IS BM 3257 (EHD K).RL 15.160m (POINT #378 ON PLAN FACE) LOCATED AT THE INTERSECTION OFALPINE VIEW LANE, WAITIKIRI DRIVE & LEN HALE PLACE.HORIZONTAL COORDINATES ARE IN TERMS OF NZ GEODETIC DATUM 2000,MOUNT PLEASANT 2000 CIRCUIT.

SURVEY ORIGIN DATA

13.40

NOTE:1. MAINTENANCE RAMP INTO PONDS TO BE

AT A GRADE OF 1V:12H AND 3.5m MINWIDTH.

PLAN1:500

8

APPENDIX FOUR:

New Styx Stormwater Outfall Plan

1

2

.

0

0

1

3

.

0

0

1

2

.

0

0

1

3

.

0

0

1

3

.

6

0

1

3

.

6

1

3

.

6

1

3

.

4

1

3

.

4

1

3

.

2

1

3

.

0

1

3

.

6

0

1

1

.

0

1

2

.

8

WETLAND LOW FLOW OUTLET(REFER DWG LD-PN-S2-DP-10)

EXISTING ARCHED ROOF BOX CULVERT

LOWER STYX ROADSTYX RIVER

EXISTING CULVERT TO BE EXTENDED WITH1700mm x 1300mm BOX CULVERT FLUSHONTO EXISTING HEADWALL

EXISTING HEADWALL

GABION BASKETS 2m x 1m x 1mFILLED WITH 75-150mm RIPRAP ROCK

7x1.55

m UNITS=10

.8

LOCALISED SHAPING & LINING OF OPENCHANNELS WITH 100-300mm ROCK

OPEN CHANNEL H

WETLAND A

1

A

150-300mm TOPSOIL

1700mm x 1300mm BOX CULVERT

SCOUR PROTECTION2 LAYERS OF 100-200mmØ ROCKS

WITH BIDIM A29 GEOTEXTILE UNDERCUT EXISTING SOFT SILTS AS DIRECTEDBY THE ENGINEER - CULVERT TO BE FOUNDEDON A MINIMUM 300mm GRAVELEMBANKMENT/COMPACTED GAP65 ON BIDIMA29 OR EQUIVALENT

100-300mm ROCK RIPRAP HELD BYCONCRETE WHERE GRADE

EXCEEDS 1V:2H

3000mm

RL 10.75 1700

mm

GABION BASKETS 2m x 1m x 1m FILLEDWITH 75-150mm RIPRAP ROCK

1550mm

RL 10.58

NEW PRECAST 1700mm H x 1300mm W x 1550mm LBOX CULVERT (HYNDS OR EQUIVALENT) FLUSHWITH EXISTING HEADWALL

EXISTING HEADWALL

UNKNOWN DEPTH OF SOFT SILT

3RL 10.61

EXISTING CONCRETECULVERT

RL 12.28

DESIGN SURFACE

EXISTING SURFACE

HANDRAIL BY OTHERS

RL 10.70

7 x 1.55m UNITS = 10.85mm

B

LOCALISED SHAPING & LININGOF OPEN CHANNELS WITH

100-300mmØ ROCK ON BIDIMA29 OR EQUIVALENT- ROCKS

TO BE HELD BY CONCRETEWHERE GRADE EXCEEDS 1V:2H

EXISTING CULVERT TO BE EXTENDED WITH1700mm x 1300mm BOX CULVERT FLUSH

ONTO EXISTING HEADWALL

GABION BASKETS2m x 1m x 1m FILLEDWITH 75-150mmRIPRAP ROCK

3m

HANDRAIL BY OTHERS

2000mm

1300mm

1510mm

UPPER SECTION OF EXISTING HEADWALLTO BE REMOVED. ALL EXPOSED REBAR TOBE GROUND BACK & EPOXY COVERED

PRECAST 1700mm x 1300mm BOXCULVERT (HYNDS OR EQUIVALENT)FLUSH ONTO EXISTING HEADWALL

EXISTING CULVERT

2100

mm

1700

mm

550m

m

INSITU 200mm x 200mm BANDAGESURROUND BOX CULVERT WITH D16REBAR AT 200mm CENTRES EPOXYRESIN INTO BOX CULVERT & EXISTINGHEADWALL

UNKNOWN DEPTH OF SOFT SILT

105mm105mm 200mm200mm

RL 10.61 IL 10.58

600mm

INSITU 200mm x 200mm CONCRETEBANDAGE SURROUND BOX CULVERT

WITH D16 REBAR AT 200mm CENTRESEPOXY RESIN INTO BOX CULVERT &

EXISTING HEADWALL

D8 REBAR AT 150mm CENTRES EPOXYRESIN INTO BOX CULVERT & HEADWALL

SMOOTH TRANSITION BETWEENEXISTING HEADWALL & CULVERT TO

BE CREATED WITH CONCRETE

UPPER SECTION OF EXISTINGHEADWALL TO BE REMOVED.EXTENT TO BE CONFIRMED BYTHE ENGINEER. ALL EXPOSEDREBAR TO BE GROUND BACK &EPOXY COVERED

550mm

190mm

75mm

75mm

150mm150mm150mm100mm

150m

m15

0mm

150m

m15

0mm

CLIENT

PRESTONS

DATE

TITLE

REVISION DETAILSDATEREV APPROVED

CHECKED

APPROVED

PROJECTDRAWN DESIGNED

223488-002PROJECT No.

SCALE SIZE

DRAWING No. REV

A1PRESTONS NORTH - STAGE 2 AND 3CULVERT EXTENSION PLAN

AND DETAILS LD-PN-S2-DP-15 0

AS SHOWN

CONSTRUCTIONL.O'SULLIVAN S.HUSBAND

J.V.AMERINGEN

N.RAYNOR0 23/01/14 ISSUED FOR CONSTRUCTION N.RAYNOR

NOTE:.

PLAN1:250

DETAIL 1-1:50

SECTION A-1:50

SECTION B-1:20

DETAIL 3-1:20

0

SCALE 1:20

200 400 800mm0

SCALE 1:250

2.5 5 10m 0

SCALE 1:50

1000500 2000mm

GRAVEL EMBANKMENT